Burglar-alarm



J. C. HUNTLY.

Burglar AIarm.

Patent-ed Juhe 12, 1860.

irur 6742271 iWM UNTTED STATES PATENT FEIQE.

BU RG LAR-ALARM.

Specification forming part of Letters Patent No. 28,671, dated June 12, 1860.

To a whom, it may 001200770:

Be it known that I, JOHN G. HUNTLY, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a new and Improved Burglar-Alarm; and Ido hereby declare that the following is a f ull, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure 1 is an external view of my invention applied to the knob of a lock or catch and set for use. Fig. 2 is a section of the same, taken in the line 4 4, Fig. 1. Fig. 3 is a section of the same, taken in the liney 3 Fig. 2. Fig. 4 is a diminished external view showing the manner in which the invention may be applied to a window.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to that class of burglar-alarms which are portable and are de signed to be readily detached from and applied to doors and windows.

The object of the invention is to obtain a simple device that will be capable of very general application, and one that may be carried conveniently in a valise or trunk by travelers, who may on enteringapply it to a door or window in a moment of time.

The invention consists in placing within a cylindrical or other suitably-shaped case an ordinary clock-alarm, the pallet-shaft of which is connected with a peculiar stop mechanism and a lever, substantially as hereinafter described, whereby the desired end is attained.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents a cylindrical case in which an ordinary clock-alarm is fitted. This alarm is composed of a coil or barrel spring a, gearing 1), scape-wheel c, and pallets (Z (Z, attached to a shaft e, to which a bell-hammer f is attached. These parts are well known, and therefore do not require a minute description.

To the pallet-shaft e an arm g is attached at right angles. This arm 9 has an opening it made in its upper part, and a shaft 2 passes through the opening h, said shaft having a conical boss 3' on itand also a spiral spring 7c, which spring has a tendency to keep the boss jout from the opening h. The shaft 11, as well as the other shafts of the alarm mechanism have their bearings in plates Z Z, which are fitted within the case A, the latter serving as a bell, against which the hammer f acts when in operation. On the end of the shaft i, which is within the case A, there is a small spur or projection m, the latter projecting from the shaft at right angles, as shown clearly in Fig. 2.

To the inner plate Z of the alarm and at its outer side there is attached a projecting hook it, which, when the projection m of the shaft 1' is made to bear against its inner side, keeps the bossj in the opening it of the arm g, and the boss j is sufficiently large to fill said opening h and'prevent the vibration of the palletshaft 2'. The shaft 1 is allowed to slide in its bearings, in order to admit of the adjustment of the projection m behind the hook at. The front end of the shaft 1' projects through the side of the case A, and to it a clamp B is attached. This clamp B is formed of two arms op, the arm 0 being the one that is attached to the shaft i and the arm 1) being attached to o bya joiutq. The outer ends of the arms 0 p are curved, so that they may be made to clasp the arbor of the knobs of a lock, and the arm 0 has a screw 1' attached, which screw passes through the arm 2) and has a thumbnuts on it, as shown clearly in Fig. 1. The axis of the shaft to which the coil or barrel spring a is attached has a button If secured on it. (See Figs. 1 and 2.)

The operation is follows: The spring a is wound up by turning the button 6, and the shaft "i is adjusted so that its projection in will bear against the inner side of the hookn and the bossj be within the opening h of the arm g. This adjustment of the shaft 1' prevents the pallets d d being moved by the action of the scape-wheel as the boss j fills up the opening h, as shown clearly in Fig. 3.

\Vhen the device is applied to a door, the

curved ends of the clamp B are fitted on the arbor of the knob at the inner side of a door, as shown clearly in Figs. 1 and 2, the shaft '5 being adjusted as stated, and if theknob at the outer side of the door be turned the clamp B will be turned and the projection m moved out free from the hook n, and the spring 70 will force the bossj out from the opening h and the arm 9 will be allowed to vibrate. As

the rod "I: is eoi'lsiderahly smaller in diameter than the opening 7L, the hammer f therefore will strike the case A and produce the alarm. A Very slight movement of the shaft '11 and projection m is sufficient to free the latter from the hook on.

In case the invention is to be applied to a Window the case A may he fitted on the upper rail of the lower sash and the curved end of the clamp B fitted on a small screw-cylinder u, which is screwed into one of the stiles of the upper sash, as shown in Fig. 4t. It is designed to have a small cylinder (4 accompany each alarm, so that they may be used when required, the cylinders being screwed into the inner plate I of the alarm, as shown in Fig. 2.

This device may be very cheaply construct ed, of small dimensions, and applied either to a door or window in a moment of time.

I I aving' thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

The arrangement of the shaft 2, with its projection m and bossj, in connection with the hook it on the inner plate Z of the alarm, the arm g, with its opening h on the pallet-shaft e, and the clamp B, attached to the shaft 2', substantially as and for the purpose set forth.

JOHN (J. IIUNTLY. Witnesses:

J. PLANKINTON, J os. L. FOX. 

